Impossibly Un-In-Love

What happens when someone tells you they love you but you don't feel the same? I think the best option is to smile uncontrollably and go in for a kiss but is lying and pushing away the feeling just plain wrong? It's possible to have feelings for someone however they could not be "it." As much as I try to feel love and to find a way on the right path it almost seems impossible, like an army of lions is guarding my future. Is it okay to be with someone knowing you'll never feel love? Is it fair to yourself? Is crushing on someone a red flag for an impossible love? Is love impossible?